peridermn.
/ˈpɛrɪdəːm/, U.S. /ˈpɛrəˌdərm/ 1. Botany. Originally: the corky layer of a plant stem. Later: an outer protective layer comprising phellem, phellogen, and phelloderm, which develops during secondary growth of shoots and roots and during wound healing.
ΘΚΠ
the world > plants > part of plant > cell or aggregate tissue > [noun] > tissue > cambium or periderm
cambium1672
peridermis1839
periderm1849
mother1862
phelloderm1875
phellogen1875
suber1913
1849 J. H. Balfour Man. Bot. § 85 After a certain period,..the corky portion becomes dead, and is thrown off.., leaving a layer of tabular cells or periderm below.
1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 81 The formation of cork is very frequently continuous..; and when this occurs uniformly over the whole circumference, there arises a stratified cork-envelope, the Periderm, replacing the epidermis.
1934 C. C. Steele Introd. Plant Biochem. iii. x. 107 Suberin is the cork-like material which occurs in the median lamella of the walls of periderm cells lying between the outer middle lamella and the inner cellulose layer.
1960 K. Esau Anat. Seed Plants xii. 142 Periderm formation is also an important phase in the development of protective layers near injured or dead (necrosed) tissues (wound periderm or wound cork).
1991 Antiquity 65 890 The mature root tubers have an outer region of cortical parenchyma beneath a narrow thickened periderm.
2. Zoology. The perisarc of a coelenterate or graptolite.In quot. 1968 periderm and perisarc are distinguished according to their composition.
ΘΚΠ
the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [noun] > class Hydrozoa > member of > hard covering
periderm1870
1870 H. A. Nicholson Man. Zool. I. viii. 77 It is invested by a strong corneous or chitinous covering, often termed the ‘periderm’.
1939 Amer. Midland Naturalist 21 261 Sollas' view that the periderm consisted of three layers is provisionally accepted and chitin considered as the substances of the periderm according to the chemical tests of Kraft.
1968 C. Bouillon in M. Florkin & B. T. Scheer Chem. Zool. II. ii. i. 83 The hydroids are lined either by a mucoproteinic periderm or a chitinous perisarc or even partially by a periderm and partially by a perisarc.
1993 E. N. K. Clarkson Invertebr. Palaeontol. & Evol. (ed. 3) x. 310/2 As in all graptolites the ‘skeleton’ of Saetograptus consists of a series of hollow interlinked tubes, constructed of a thin sheet-like material known as periderm.
3. Embryology. The outer layer of the epidermis of an embryo. Also called peridermis.
ΚΠ
1960 B. I. Balinsky Introd. Embryol. x. 273 In amphibians the epithelium consists of two rows of cells: the outer covering layer or periderm and the inner so-called sensory layer.
1986 Proc. National Acad. Sci. U.S.A. 83 8237/1 The periderm was a single-layered squamous epithelium on the top surface of the explant.
1998 Proc. National Acad. Sci. U.S.A. 95 1048/2 The periderm..should normally detach from the epidermis before birth in mice.
Derivatives
periˈdermic adj. Botany rare = peridermal adj.
ΘΚΠ
the world > plants > part of plant > cell or aggregate tissue > [adjective] > of cambium or periderm
procambial1872
cambial1881
cambiform1882
peridermal1884
phellodermal1884
phellogenetic1884
phellogenic1884
peridermic1890
1890 Cent. Dict. Peridermic, same as peridermal.
1899 Philos. Trans. (Royal Soc.) B. 191 107 Opposite the third peridermic protrusion..is an appendage seen in oblique transverse section.
1926 Bot. Gaz. 82 74 Their..appearance is usually followed promptly by the origin of the initial peridermic sheath.
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).
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n.1849